Electric conductor



Oct. 7, 1924. 1,510,558

R. RUDENBERG ELECTRIC CONDUCTOR Original Filed May 11 1917 Patented Oct. 7, 1924.

UNITED STATES PATENT OFFICE.

REINHOLD Rtl'DENBERGr, OF IBERLIN-GHARLOTTENBURG, GERMANY, ASSIGNOR TO SIEMENS-SCHUCKERTWERKE GESELLSCHAFT MIT BESCHRANKTER HAFTUNG, OF SIEMENSSTADT, NEAR BERLIN, GERMANY, A GERMAN CORPORATION.

ELECTRIC CONDUCTOR.

Original application filed May 11, 1917, Serial No. 168,030. Divided and this application filed February 1, 1924. Serial No. 690,094.

To all whom it may concern:

Be it known that I, RETNHOLD RfmENBnnG, a citizen of the German Empire, residing at Berlin-Charlottenburg, Germany, have invented certain new and useful Improvements in Electric Conductors, of which the following is a specification.

My invention refers to the conductors employed in connection with electric machinery and more especially to conductors disposed one above the other within the slots of rotors or the like, these said superposed conductors being united by twisting.

It is well known that such twisted slot conductors may either be produced by winding the part conductors around a fiat core, or preferably by winding the conductors into the shape of a cylindrical tube and then flattening the whole by pressure. As a matter of course the part-conductors should be suitably insulated from each other.

The novel mode of manufacturing twisted conductors of this kind in accordance with my present invention is illustrated in Figs. 1 to 3 of the drawing affixed to this specification,

Fig. 1 being a side elevation,

Fig. 2 a plan and Fig. 3 a crosssection of a conductor.

The novel method substantially consists in forming oblique indentures i in the sides of a flattened tube 00 of conducting material, the indentures being made to pass also from one side to the other across the narrow faces thereof. In order to avoid damaging one side of the tube while forming the indentures on the other side, I prefer pressing the tube first around a flat core about 1 to 2 mm thick. After the indentures have been produced by sawing, milling or the like, the core which may consist of some suitable insulating material is removed. The remaining hollow space fully suffices to allow the removal of the fins formed on the inside by the sawing or milling operation. After the indentures have been finished, another core 2 is introduced, this core consisting either of iron if this be required or of insulating material, preferably thin mica strips of 0.1 to 0.2 mm. After this core has been introduced together with a suitable agglutinant, the bar is fully compressed and the single turns are held together by the agglutinant. Preferably the indentures are not distributed over the entire length of the tube, but solid ends 2 are left which secure a good electrical connection between the single turns and render the conductor as a whole less fragile.

I claim:

1. The method which consists in insert ing a core in a conductive tube, then press ing said tube flat, thereupon providing said flattened tube on its flat faces with an obliquely disposed cut running across to the narrow faces of said tube, withdrawing said core and removing the inner ridge of the edge of the said out.

2. The method of manufacturing twisted conductor bars, which consists in providing a flattened conductive tube on its fiat faces with an obliquely disposed out running across to the narrow faces of said tube, inserting a thin core of insulating material and then pressing said tube to gether and gluing it.

3. The method of manufacturing twisted conductor bars, which consists in inserting a fiat core in a conductive tube, then pressing said tube flat, thereupon providing said flattened tube on its fiat faces with obliquely disposed cuts running across to the narrow faces of said tube and terminating at some distance from the ends of said tube, withdrawing said core, removing the inner ridge of the edges of the said cuts, inserting a thin core of insulating material and then pressing the said flat tube together and gluing it to the said insulating core.

4. Conductor bar consisting of a flat metal tube having oblique indentures subdividing said tube into a plurality of spiral strips.

Conductor bar donsisting of flat metal tube having oblique indentures distributed over part of said tube so as to subdivide said part into a. plurality of spiral strips.

6. Conductor bar consisting of aflat metal tube, having oblique indentures subdividing said tube into a plurality of spiral strips and a core of insulating material within said tube.

In testimony whereof I aifix my signature.

REINHOLD RIJDENBERG. 

